Case for a breathing mask or breathing apparatus unit



FIG. 1 is a rear top perspective view of a case for a breathing mask or breathing apparatus unit showing my new design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a left side elevation view thereof, the right side elevation view being a mirror image of that shown. 

The ornamental design for a case for a breathing mask or breathing apparatus unit, as shown and described. 